inotify-init.xml

<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->

<refentry xml:id="function.inotify-init" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
 <refnamediv>
  <refname>inotify_init</refname>
  <refpurpose>Initialize an inotify instance</refpurpose>
 </refnamediv>
 
 <refsect1 role="description"><!-- {{{ -->
  &reftitle.description;
  <methodsynopsis>
   <type class="union"><type>resource</type><type>false</type></type><methodname>inotify_init</methodname>
   <void />
  </methodsynopsis>
  <para>
   Initialize an inotify instance for use with
   <function>inotify_add_watch</function>
  </para>
 </refsect1><!-- }}} -->

 <refsect1 role="parameters">
  &reftitle.parameters;
  &no.function.parameters;
 </refsect1>
 
 <refsect1 role="returnvalues"><!-- {{{ -->
  &reftitle.returnvalues;
  <para>
   A stream resource or &false; on error.
  </para>
 </refsect1><!-- }}} -->
 
 <refsect1 role="examples"><!-- {{{ -->
  &reftitle.examples;
  <para>
   <example xml:id="inotify-init.example.basic"><!-- {{{ -->
    <title>Example usage of inotify</title>
    <programlisting role="php">
<![CDATA[
<?php
// Open an inotify instance
$fd = inotify_init();

// Watch __FILE__ for metadata changes (e.g. mtime)
$watch_descriptor = inotify_add_watch($fd, __FILE__, IN_ATTRIB);

// generate an event
touch(__FILE__);

// Read events
$events = inotify_read($fd);
print_r($events);

// The following methods allows to use inotify functions without blocking on inotify_read():

// - Using stream_select() on $fd:
$read = array($fd);
$write = null;
$except = null;
stream_select($read,$write,$except,0);

// - Using stream_set_blocking() on $fd
stream_set_blocking($fd, 0);
inotify_read($fd); // Does no block, and return false if no events are pending

// - Using inotify_queue_len() to check if event queue is not empty
$queue_len = inotify_queue_len($fd); // If > 0, inotify_read() will not block

// Stop watching __FILE__ for metadata changes
inotify_rm_watch($fd, $watch_descriptor);

// Close the inotify instance
// This may have closed all watches if this was not already done
fclose($fd);

?>
]]>
    </programlisting>
    &example.outputs.similar;
    <screen>
<![CDATA[
array(
  array(
    'wd' => 1,     // Equals $watch_descriptor
    'mask' => 4,   // IN_ATTRIB bit is set
    'cookie' => 0, // unique id to connect related events (e.g. 
                   // IN_MOVE_FROM and IN_MOVE_TO events)
    'name' => '',  // the name of a file (e.g. if we monitored changes
                   // in a directory)
  ),
);
]]>
    </screen>
   </example><!-- }}} -->
  </para>
 </refsect1><!-- }}} -->
 
 <refsect1 role="seealso"><!-- {{{ -->
  &reftitle.seealso;
  <para>
   <simplelist>
    <member><function>inotify_add_watch</function></member>
    <member><function>inotify_rm_watch</function></member>
    <member><function>inotify_queue_len</function></member>
    <member><function>inotify_read</function></member>
    <member><function>fclose</function></member>
   </simplelist>
  </para>
 </refsect1><!-- }}} -->

</refentry>
 
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